The gentle delights of Schadenfreude aren't confined to laughing at someone slipping on the proverbial banana peel so you have to expect a bit on these sort of forums.
In these sort of matters, the advice you get is just going to be based on a sample of one or two at the most and perversely, we probably don't hear about the failures, only the successes, so you can't extrapolate too far.
The Poder I have for myself driving my own company car (once I am over the Argentine border) was based on a real one written by the "lawyer" that did work and I have done it in reasonable Spanish, google translated Portuguese and paraphrased English printed on card stock and with the US notarisation pasted on the back looks nearly as impressive as the one issued in BA, but may turn out to be not worth the paper it is printed on.
Separate to the two confiscations that were reported on forums, I also remember a lady in Ushuiai last Christmas telling several fellow travellers of their fairly expensive escapade. They did get an official Argentine Bill of Sale drawn up and witnessed and dated and headed for the border. Officer said this document proves you bought the vehicle in Argentina and that is illegal and you are in trouble. She refused to tell us exactly what it cost to get their vehicle back - said too embarrassed to - other than to say it was a very large amount. The fine did succeed in getting everything regularised and they continued their planned trip with no other problems other than a lighter wallet.
That doesn't help you much of course but might help in the planning. Even if the worst happens, I doubt whether there is much chance of getting into trouble personally.
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